WO2014086296A1

WO2014086296A1 - Method of local filling to control surface subsidence in gob

Info

Publication number: WO2014086296A1
Application number: PCT/CN2013/088618
Authority: WO
Inventors: 马立强; 曹新奇; 李盼
Original assignee: 中国矿业大学
Priority date: 2012-12-07
Filing date: 2013-12-05
Publication date: 2014-06-12
Also published as: AU2013354613B2; CN103016053A; CN103016053B; ZA201500071B; AU2013354613A1

Abstract

A method of local filling to control surface subsidence in a gob. Metal nets are suspended at intervals from open-off cuts and on top plates behind a hydraulic bracket on a working surface along with coal cutting of a coal cutter and movement of the hydraulic bracket on the working surface, and filling bags are arranged; coal cutting is stopped after cutting is performed once by the coal cutter, and concrete is filled into the filling bags in the metal nets in sequence until a roof; cutting is continuously performed once by the coal cutter, metal nets are continuously suspended on top plates adjacent to the two sides of the filled area, filling is continuously performed to complete a filling cycle, and a row of filled bodies are formed in a gob parallel to the working surface; and coal cutting is continuously performed four to five times by the coal cutter, the following filling cycle is completed continuously, and the procedures are repeated until filling of the whole gob is completed and a plurality of rows of filled bodies are formed in the gob. The method is simple, and the filling cost is low. The top plates in the gob are supported uniformly at intervals; therefore, the stability of an overburden layer, in particular a key layer, can be improved, and surface subsidence and damage to buildings can be effectively prevented.

Description

Method for controlling surface subsidence by partial filling of goaf

Technical field

The invention relates to the technical field of coal mining, in particular to a method for controlling the surface subsidence of a goaf in a mine with a "three down" coal mining and a relatively stable coal seam roof.

technical background

China's production of mines "three down" coal is about 14 billion tons, for 10 years of production of 10 million tons of mines for 140 a, of which coal is about 9 billion tons under the building. How to properly solve the problem of coal mining under buildings has always been one of the important issues that plague Chinese coal mining enterprises.

In view of post-harvest ground subsidence control, the domestic and international aspects mainly start from the aspects of subsidence mining and roof movement control of goaf overburden:

The mining technology mainly includes strip mining and room-column mining. Strip mining is to divide the mined coal seam into more regular strips, and then take a strip to reduce surface subsidence. This technology is widely used in China. Its biggest advantage is that it can follow the existing coal mining process, with less cost increase and easy production management. At the same time, it has a significant effect on reducing surface settlement. Its shortcoming is mainly due to low production rate (generally From 30% to 50%), the resource loss is serious. Room-column mining is a relatively mature coal mining technology used in the United States, Australia, South Africa, etc. It is not only a conventional coal mining method, but also a mining method for surface subsidence control. This method has application in some mining areas in China, and its economic benefits. Preferably, the disadvantages are low resource recovery rate and poor ventilation conditions, which are only applicable to coal seams with relatively simple geological conditions;

The roof overburden movement control technology in the goaf mainly includes all filling techniques, partial filling techniques, separation grouting technology, and filling and grouting technology in the caving area. All filling techniques use filling materials to fill the goaf to form a filling body, thereby preventing the roof from falling and restricting the movement of the roof. This method can effectively reduce the surface subsidence and increase the coal recovery rate, but because of its high cost. Very limited. Partial filling technology is to fill the local or separated zone and the falling zone of the goaf, and control the mining subsidence by supporting the overlying strata with the key layer structure of the overburden, the filling body and some coal pillars. The separation grouting technology starts from the internal movement law of the rock stratum, determines the position of the overburden strata after the mining, and fills the medium with the fly ash and other medium from the surface drilling to the separation layer, so as to achieve the purpose of controlling the surface subsidence. Grouting and parallel mining work in parallel, do not interfere with each other, but the application of the separation position and the amount of separation is difficult to accurately determine and is limited in application. The grouting filling technology in the caving area is to fill and reinforce the rock in the goaf before it is compacted, so as to support the overburden and slow down the surface subsidence. The technology is still in the research stage and has not been widely used. .

Theoretically, the use of filling and mining technology to fill solid waste such as coal gangue as a main filling material can reduce waste discharge such as vermiculite, on the other hand, it can slow down mining subsidence and achieve coal mining under buildings. Requirements for coal recycling economy and green mining. But how to develop a filling that suits the characteristics and requirements of coal mines The problem of mining technology still needs to be resolved. How to reduce the cost of filling and mining is a key issue that needs to be solved in coal mine filling and mining technology.

The research on coal mine filling technology should make full use of the movement law and control characteristics of coal-bearing layered rock layers. The relevant research proves that the key layer of overburden plays a role in controlling the surface movement process. The breaking of the main key layer will lead to the rapid subsidence of the surface and the obvious increase of the subsidence. The surface subsidence speed will be periodically broken with the main key layer. Jumping changes. Thus, controlling the main key layer can effectively control surface subsidence.

Summary of the invention

Technical Problem: The object of the present invention is to overcome the deficiencies in the prior art and to provide a method for controlling surface subsidence by using a partial filling of a goaf in a simple method, convenient operation, and low cost.

Technical Solution: The method for partially filling and controlling surface subsidence of the goaf of the present invention comprises the following steps: a. arranging a concrete conveying pipe in a working surface transportation roadway, and installing a concrete conveying pump on the downhole working surface equipment train at work a filling pipe connected to the concrete conveying pipe is suspended on the tail beam of the surface hydraulic support, and a plurality of filling regions are arranged at intervals between the hydraulic supports at the lower end of the working surface, and a discharging port is arranged at a filling pipe position corresponding to each filling region;

b. Starting from the opening of the eye, as the shearer begins to cut coal to the hydraulic support of the working face, the metal mesh is suspended from the top plate behind the hydraulic support on the working face, and a filling bag is arranged in the metal mesh;

c When the shearer cuts a piece of coal and cuts the knife after cutting, the concrete pump is opened, and the concrete is conveyed to the filling area through the filling pipeline through the concrete conveying pipeline;

d. sequentially open the discharge port on the filling pipe of each filling area, fill the filling bag provided in the metal mesh with the concrete to the top, and close the filling bag;

e. The shearer continues to cut the coal, and the metal mesh is continued on the top plate on both sides of the filled filling area, and the filling bag is placed in the metal mesh. Repeat step ^d to complete a filling cycle. Forming a row of filling bodies in the goaf parallel to the working face;

f. After the coal miner continuously cuts 4~5 knives, repeat steps c, d, and e, continue the filling operation of the next cycle, and repeat until the filling operation of the entire goaf is completed, so that the goaf forms multiple rows of filling. body.

Advantageous Effects: The invention adopts a partial filling mining method on the basis of strip filling, which can reduce the filling amount and filling amount of the filling material and reduce the filling cost. By changing the arrangement of the filling body, the top plate of the goaf is evenly supported, which is beneficial to the stability of the roof and the key layer. The filling of rectangular areas in the goaf evenly reduces the filling amount, reduces the filling cost, improves the recovery rate, and improves the stability of the key layer of the overlying strata, so that the surface subsidence can be effectively controlled. The method is simple and low in cost. DRAWINGS

1 is a schematic view showing a partial filling layout of a goaf in a fully mechanized mining face of the present invention.

In the picture: 1-working surface track leveling, 2-working surface transporting alley, 3-concrete conveying pipe, 4-filling pipe, 5- discharge port, 6-face scraper conveyor, 7-miner , 8-transport flat belt conveyor, 9-equipment train, 10-filler.

detailed description

An embodiment of the present invention will be further described below with reference to the accompanying drawings:

The method for local filling control of surface goaf in the goaf of the present invention:

First, the concrete conveying pipe 3 is arranged in the working face transportation lane 2, and the concrete conveying pump is installed on the downhole working surface equipment train 9, and the filling pipe connected with the concrete conveying pipe 3 is suspended on the working face hydraulic support tail beam. 4, a plurality of filling areas are arranged between the lower end hydraulic supports on the working surface, and a discharging port 5 is arranged at the filling pipe 4 corresponding to each filling area;

b. Starting from the opening of the eye, as the shearer begins to cut coal to the hydraulic support of the working face, the metal mesh is suspended at the top of the working face behind the hydraulic support, and a filling bag is placed in the metal mesh. The length of the metal mesh on the side perpendicular to the direction of advancement of the working surface is 4 to 5 m, and the width on both sides parallel to the advancing direction is 0.6 to 0.8 m;

c. When the shearer cuts a piece of coal and cuts the knife after cutting, the concrete pump is opened, and the concrete is transported through the concrete pipeline 3 through the filling pipe 4 to the filling area;

d. sequentially open the discharge port 5 on each filling area filling pipe 4, fill the filling bag provided in the metal mesh to the top, and close the filling bag;

e. The shearer continues to cut the coal, and the metal mesh is continued on the top plate on both sides of the filled filling area, and the filling bag is placed in the metal mesh. Repeat step ^d to complete a filling cycle. A row of filling bodies 10 is formed in the goaf parallel to the working surface, the filling cycle step is 1.2~1.6 m, which can be adjusted according to the actual situation on the site, and finally a filling body 10 with a certain strength is formed;

f. After the coal miner continuously cuts 4~5 knives, the propulsion length is 2.4~4 m, which can be adjusted according to the actual situation. Repeat steps d and e to continue the filling operation of the next cycle, and repeat until the entire gob area is completed. The filling operation causes the goaf to form a plurality of rows of filling bodies 10.

Claims

Claim

A method for controlling surface subsidence by partial filling of a goaf, characterized in that it comprises the following steps: a. arranging a concrete conveying pipe (3) in a working face transporting alley (2), and at the same time working in a downhole working surface equipment train A concrete pump is installed on the working face, and a filling pipe (4) connected to the concrete conveying pipe (3) is suspended on the tail beam of the hydraulic support on the working face, and a plurality of filling regions are arranged at intervals between the hydraulic supports at the lower end of the working surface, Filling pipe (4) corresponding to the filling area is provided with a discharge opening (5);

c When the shearer cuts a piece of coal and cuts the knife after cutting, the concrete pump is turned on, the concrete conveying pipe is opened, and the concrete is conveyed to the filling area through the filling pipe (4);

d. Open the discharge port (5) on each filling area filling pipe (4) in turn, fill the filling bag provided in the metal mesh to the top, and close the filling bag;

e. The shearer continues to cut the coal, and the metal mesh is continued on the top plate on both sides of the filled filling area, and the filling bag is placed in the metal mesh. Steps c and d are repeated to complete a filling cycle. Forming a row of filling bodies (10) in the goaf parallel to the working surface;

f. After the coal miner continuously cuts 4~5 knives, repeat steps 0, d, and e, continue the filling operation of the next cycle, and repeat until the filling operation of the entire goaf is completed, so that the goaf forms multiple rows of filling. Body (10).